2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
4 * James Leu (jleu@mindspring.net).
5 * Copyright (C) 2001 by various other people who didn't put their name here.
6 * Licensed under the GPL.
9 #include <linux/bootmem.h>
10 #include <linux/etherdevice.h>
11 #include <linux/ethtool.h>
12 #include <linux/inetdevice.h>
13 #include <linux/init.h>
14 #include <linux/list.h>
15 #include <linux/netdevice.h>
16 #include <linux/platform_device.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/skbuff.h>
19 #include <linux/slab.h>
20 #include <linux/spinlock.h>
24 #include "mconsole_kern.h"
28 #define DRIVER_NAME "uml-netdev"
30 static DEFINE_SPINLOCK(opened_lock);
31 static LIST_HEAD(opened);
34 * The drop_skb is used when we can't allocate an skb. The
35 * packet is read into drop_skb in order to get the data off the
36 * connection to the host.
37 * It is reallocated whenever a maximum packet size is seen which is
38 * larger than any seen before. update_drop_skb is called from
39 * eth_configure when a new interface is added.
41 static DEFINE_SPINLOCK(drop_lock);
42 static struct sk_buff *drop_skb;
45 static int update_drop_skb(int max)
51 spin_lock_irqsave(&drop_lock, flags);
57 new = dev_alloc_skb(max);
68 spin_unlock_irqrestore(&drop_lock, flags);
73 static int uml_net_rx(struct net_device *dev)
75 struct uml_net_private *lp = netdev_priv(dev);
79 /* If we can't allocate memory, try again next round. */
80 skb = dev_alloc_skb(lp->max_packet);
83 /* Read a packet into drop_skb and don't do anything with it. */
84 (*lp->read)(lp->fd, drop_skb, lp);
85 dev->stats.rx_dropped++;
90 skb_put(skb, lp->max_packet);
91 skb_reset_mac_header(skb);
92 pkt_len = (*lp->read)(lp->fd, skb, lp);
95 skb_trim(skb, pkt_len);
96 skb->protocol = (*lp->protocol)(skb);
98 dev->stats.rx_bytes += skb->len;
99 dev->stats.rx_packets++;
108 static void uml_dev_close(struct work_struct *work)
110 struct uml_net_private *lp =
111 container_of(work, struct uml_net_private, work);
115 static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
117 struct net_device *dev = dev_id;
118 struct uml_net_private *lp = netdev_priv(dev);
121 if (!netif_running(dev))
124 spin_lock(&lp->lock);
125 while ((err = uml_net_rx(dev)) > 0) ;
128 "Device '%s' read returned %d, shutting it down\n",
130 /* dev_close can't be called in interrupt context, and takes
132 * And dev_close() can be safely called multiple times on the
133 * same device, since it tests for (dev->flags & IFF_UP). So
134 * there's no harm in delaying the device shutdown.
135 * Furthermore, the workqueue will not re-enqueue an already
136 * enqueued work item. */
137 schedule_work(&lp->work);
140 reactivate_fd(lp->fd, UM_ETH_IRQ);
143 spin_unlock(&lp->lock);
147 static int uml_net_open(struct net_device *dev)
149 struct uml_net_private *lp = netdev_priv(dev);
157 lp->fd = (*lp->open)(&lp->user);
163 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
164 IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
166 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
171 lp->tl.data = (unsigned long) &lp->user;
172 netif_start_queue(dev);
174 /* clear buffer - it can happen that the host side of the interface
175 * is full when we get here. In this case, new data is never queued,
176 * SIGIOs never arrive, and the net never works.
178 while ((err = uml_net_rx(dev)) > 0) ;
180 spin_lock(&opened_lock);
181 list_add(&lp->list, &opened);
182 spin_unlock(&opened_lock);
186 if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
192 static int uml_net_close(struct net_device *dev)
194 struct uml_net_private *lp = netdev_priv(dev);
196 netif_stop_queue(dev);
198 free_irq(dev->irq, dev);
199 if (lp->close != NULL)
200 (*lp->close)(lp->fd, &lp->user);
203 spin_lock(&opened_lock);
205 spin_unlock(&opened_lock);
210 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
212 struct uml_net_private *lp = netdev_priv(dev);
216 netif_stop_queue(dev);
218 spin_lock_irqsave(&lp->lock, flags);
220 len = (*lp->write)(lp->fd, skb, lp);
222 if (len == skb->len) {
223 dev->stats.tx_packets++;
224 dev->stats.tx_bytes += skb->len;
225 dev->trans_start = jiffies;
226 netif_start_queue(dev);
228 /* this is normally done in the interrupt when tx finishes */
229 netif_wake_queue(dev);
232 netif_start_queue(dev);
233 dev->stats.tx_dropped++;
236 netif_start_queue(dev);
237 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
240 spin_unlock_irqrestore(&lp->lock, flags);
247 static void uml_net_set_multicast_list(struct net_device *dev)
252 static void uml_net_tx_timeout(struct net_device *dev)
254 dev->trans_start = jiffies;
255 netif_wake_queue(dev);
258 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
265 #ifdef CONFIG_NET_POLL_CONTROLLER
266 static void uml_net_poll_controller(struct net_device *dev)
268 disable_irq(dev->irq);
269 uml_net_interrupt(dev->irq, dev);
270 enable_irq(dev->irq);
274 static void uml_net_get_drvinfo(struct net_device *dev,
275 struct ethtool_drvinfo *info)
277 strcpy(info->driver, DRIVER_NAME);
278 strcpy(info->version, "42");
281 static const struct ethtool_ops uml_net_ethtool_ops = {
282 .get_drvinfo = uml_net_get_drvinfo,
283 .get_link = ethtool_op_get_link,
286 static void uml_net_user_timer_expire(unsigned long _conn)
289 struct connection *conn = (struct connection *)_conn;
291 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
296 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
304 for (i = 0; i < 6; i++) {
305 addr[i] = simple_strtoul(str, &end, 16);
307 ((*end != ':') && (*end != ',') && (*end != '\0'))) {
309 "setup_etheraddr: failed to parse '%s' "
310 "as an ethernet address\n", str);
315 if (is_multicast_ether_addr(addr)) {
317 "Attempt to assign a multicast ethernet address to a "
318 "device disallowed\n");
321 if (!is_valid_ether_addr(addr)) {
323 "Attempt to assign an invalid ethernet address to a "
324 "device disallowed\n");
327 if (!is_local_ether_addr(addr)) {
329 "Warning: Assigning a globally valid ethernet "
330 "address to a device\n");
331 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
332 "the first byte of the MAC,\n");
333 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
334 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
341 "Choosing a random ethernet address for device %s\n", name);
342 random_ether_addr(addr);
345 static DEFINE_SPINLOCK(devices_lock);
346 static LIST_HEAD(devices);
348 static struct platform_driver uml_net_driver = {
354 static void net_device_release(struct device *dev)
356 struct uml_net *device = dev_get_drvdata(dev);
357 struct net_device *netdev = device->dev;
358 struct uml_net_private *lp = netdev_priv(netdev);
360 if (lp->remove != NULL)
361 (*lp->remove)(&lp->user);
362 list_del(&device->list);
367 static const struct net_device_ops uml_netdev_ops = {
368 .ndo_open = uml_net_open,
369 .ndo_stop = uml_net_close,
370 .ndo_start_xmit = uml_net_start_xmit,
371 .ndo_set_rx_mode = uml_net_set_multicast_list,
372 .ndo_tx_timeout = uml_net_tx_timeout,
373 .ndo_set_mac_address = eth_mac_addr,
374 .ndo_change_mtu = uml_net_change_mtu,
375 .ndo_validate_addr = eth_validate_addr,
376 #ifdef CONFIG_NET_POLL_CONTROLLER
377 .ndo_poll_controller = uml_net_poll_controller,
382 * Ensures that platform_driver_register is called only once by
383 * eth_configure. Will be set in an initcall.
385 static int driver_registered;
387 static void eth_configure(int n, void *init, char *mac,
388 struct transport *transport)
390 struct uml_net *device;
391 struct net_device *dev;
392 struct uml_net_private *lp;
395 size = transport->private_size + sizeof(struct uml_net_private);
397 device = kzalloc(sizeof(*device), GFP_KERNEL);
398 if (device == NULL) {
399 printk(KERN_ERR "eth_configure failed to allocate struct "
404 dev = alloc_etherdev(size);
406 printk(KERN_ERR "eth_configure: failed to allocate struct "
407 "net_device for eth%d\n", n);
408 goto out_free_device;
411 INIT_LIST_HEAD(&device->list);
414 /* If this name ends up conflicting with an existing registered
415 * netdevice, that is OK, register_netdev{,ice}() will notice this
418 snprintf(dev->name, sizeof(dev->name), "eth%d", n);
420 setup_etheraddr(mac, device->mac, dev->name);
422 printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac);
424 lp = netdev_priv(dev);
425 /* This points to the transport private data. It's still clear, but we
426 * must memset it to 0 *now*. Let's help the drivers. */
428 INIT_WORK(&lp->work, uml_dev_close);
431 if (!driver_registered) {
432 platform_driver_register(¨_net_driver);
433 driver_registered = 1;
436 device->pdev.name = DRIVER_NAME;
437 device->pdev.dev.release = net_device_release;
438 dev_set_drvdata(&device->pdev.dev, device);
439 if (platform_device_register(&device->pdev))
440 goto out_free_netdev;
441 SET_NETDEV_DEV(dev,&device->pdev.dev);
446 * These just fill in a data structure, so there's no failure
447 * to be worried about.
449 (*transport->kern->init)(dev, init);
451 *lp = ((struct uml_net_private)
452 { .list = LIST_HEAD_INIT(lp->list),
455 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
456 .max_packet = transport->user->max_packet,
457 .protocol = transport->kern->protocol,
458 .open = transport->user->open,
459 .close = transport->user->close,
460 .remove = transport->user->remove,
461 .read = transport->kern->read,
462 .write = transport->kern->write,
463 .add_address = transport->user->add_address,
464 .delete_address = transport->user->delete_address });
467 spin_lock_init(&lp->lock);
468 lp->tl.function = uml_net_user_timer_expire;
469 memcpy(lp->mac, device->mac, sizeof(lp->mac));
471 if ((transport->user->init != NULL) &&
472 ((*transport->user->init)(&lp->user, dev) != 0))
475 /* don't use eth_mac_addr, it will not work here */
476 memcpy(dev->dev_addr, device->mac, ETH_ALEN);
477 dev->mtu = transport->user->mtu;
478 dev->netdev_ops = ¨_netdev_ops;
479 dev->ethtool_ops = ¨_net_ethtool_ops;
480 dev->watchdog_timeo = (HZ >> 1);
481 dev->irq = UM_ETH_IRQ;
483 err = update_drop_skb(lp->max_packet);
485 goto out_undo_user_init;
488 err = register_netdevice(dev);
491 goto out_undo_user_init;
493 spin_lock(&devices_lock);
494 list_add(&device->list, &devices);
495 spin_unlock(&devices_lock);
500 if (transport->user->remove != NULL)
501 (*transport->user->remove)(&lp->user);
503 platform_device_unregister(&device->pdev);
504 return; /* platform_device_unregister frees dev and device */
511 static struct uml_net *find_device(int n)
513 struct uml_net *device;
514 struct list_head *ele;
516 spin_lock(&devices_lock);
517 list_for_each(ele, &devices) {
518 device = list_entry(ele, struct uml_net, list);
519 if (device->index == n)
524 spin_unlock(&devices_lock);
528 static int eth_parse(char *str, int *index_out, char **str_out,
532 int n, err = -EINVAL;
534 n = simple_strtoul(str, &end, 0);
536 *error_out = "Bad device number";
542 *error_out = "Expected '=' after device number";
547 if (find_device(n)) {
548 *error_out = "Device already configured";
558 struct list_head list;
563 static DEFINE_SPINLOCK(transports_lock);
564 static LIST_HEAD(transports);
566 /* Filled in during early boot */
567 static LIST_HEAD(eth_cmd_line);
569 static int check_transport(struct transport *transport, char *eth, int n,
570 void **init_out, char **mac_out)
574 len = strlen(transport->name);
575 if (strncmp(eth, transport->name, len))
581 else if (*eth != '\0')
584 *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
585 if (*init_out == NULL)
588 if (!transport->setup(eth, mac_out, *init_out)) {
595 void register_transport(struct transport *new)
597 struct list_head *ele, *next;
598 struct eth_init *eth;
603 spin_lock(&transports_lock);
604 BUG_ON(!list_empty(&new->list));
605 list_add(&new->list, &transports);
606 spin_unlock(&transports_lock);
608 list_for_each_safe(ele, next, ð_cmd_line) {
609 eth = list_entry(ele, struct eth_init, list);
610 match = check_transport(new, eth->init, eth->index, &init,
614 else if (init != NULL) {
615 eth_configure(eth->index, init, mac, new);
618 list_del(ð->list);
622 static int eth_setup_common(char *str, int index)
624 struct list_head *ele;
625 struct transport *transport;
630 spin_lock(&transports_lock);
631 list_for_each(ele, &transports) {
632 transport = list_entry(ele, struct transport, list);
633 if (!check_transport(transport, str, index, &init, &mac))
636 eth_configure(index, init, mac, transport);
643 spin_unlock(&transports_lock);
647 static int __init eth_setup(char *str)
649 struct eth_init *new;
653 err = eth_parse(str, &n, &str, &error);
655 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
660 new = alloc_bootmem(sizeof(*new));
662 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
666 INIT_LIST_HEAD(&new->list);
670 list_add_tail(&new->list, ð_cmd_line);
674 __setup("eth", eth_setup);
675 __uml_help(eth_setup,
676 "eth[0-9]+=<transport>,<options>\n"
677 " Configure a network device.\n\n"
680 static int net_config(char *str, char **error_out)
684 err = eth_parse(str, &n, &str, error_out);
688 /* This string is broken up and the pieces used by the underlying
689 * driver. So, it is freed only if eth_setup_common fails.
691 str = kstrdup(str, GFP_KERNEL);
693 *error_out = "net_config failed to strdup string";
696 err = !eth_setup_common(str, n);
702 static int net_id(char **str, int *start_out, int *end_out)
707 n = simple_strtoul(*str, &end, 0);
708 if ((*end != '\0') || (end == *str))
717 static int net_remove(int n, char **error_out)
719 struct uml_net *device;
720 struct net_device *dev;
721 struct uml_net_private *lp;
723 device = find_device(n);
728 lp = netdev_priv(dev);
731 unregister_netdev(dev);
732 platform_device_unregister(&device->pdev);
737 static struct mc_device net_mc = {
738 .list = LIST_HEAD_INIT(net_mc.list),
740 .config = net_config,
743 .remove = net_remove,
747 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
750 struct in_ifaddr *ifa = ptr;
751 struct net_device *dev = ifa->ifa_dev->dev;
752 struct uml_net_private *lp;
753 void (*proc)(unsigned char *, unsigned char *, void *);
754 unsigned char addr_buf[4], netmask_buf[4];
756 if (dev->netdev_ops->ndo_open != uml_net_open)
759 lp = netdev_priv(dev);
764 proc = lp->add_address;
767 proc = lp->delete_address;
771 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
772 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
773 (*proc)(addr_buf, netmask_buf, &lp->user);
778 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
779 static struct notifier_block uml_inetaddr_notifier = {
780 .notifier_call = uml_inetaddr_event,
783 static void inet_register(void)
785 struct list_head *ele;
786 struct uml_net_private *lp;
787 struct in_device *ip;
788 struct in_ifaddr *in;
790 register_inetaddr_notifier(¨_inetaddr_notifier);
792 /* Devices may have been opened already, so the uml_inetaddr_notifier
793 * didn't get a chance to run for them. This fakes it so that
794 * addresses which have already been set up get handled properly.
796 spin_lock(&opened_lock);
797 list_for_each(ele, &opened) {
798 lp = list_entry(ele, struct uml_net_private, list);
799 ip = lp->dev->ip_ptr;
804 uml_inetaddr_event(NULL, NETDEV_UP, in);
808 spin_unlock(&opened_lock);
811 static inline void inet_register(void)
816 static int uml_net_init(void)
818 mconsole_register_dev(&net_mc);
823 __initcall(uml_net_init);
825 static void close_devices(void)
827 struct list_head *ele;
828 struct uml_net_private *lp;
830 spin_lock(&opened_lock);
831 list_for_each(ele, &opened) {
832 lp = list_entry(ele, struct uml_net_private, list);
833 free_irq(lp->dev->irq, lp->dev);
834 if ((lp->close != NULL) && (lp->fd >= 0))
835 (*lp->close)(lp->fd, &lp->user);
836 if (lp->remove != NULL)
837 (*lp->remove)(&lp->user);
839 spin_unlock(&opened_lock);
842 __uml_exitcall(close_devices);
844 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
848 struct net_device *dev = d;
849 struct in_device *ip = dev->ip_ptr;
850 struct in_ifaddr *in;
851 unsigned char address[4], netmask[4];
853 if (ip == NULL) return;
856 memcpy(address, &in->ifa_address, sizeof(address));
857 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
858 (*cb)(address, netmask, arg);
863 int dev_netmask(void *d, void *m)
865 struct net_device *dev = d;
866 struct in_device *ip = dev->ip_ptr;
867 struct in_ifaddr *in;
868 __be32 *mask_out = m;
877 *mask_out = in->ifa_mask;
881 void *get_output_buffer(int *len_out)
885 ret = (void *) __get_free_pages(GFP_KERNEL, 0);
886 if (ret) *len_out = PAGE_SIZE;
891 void free_output_buffer(void *buffer)
893 free_pages((unsigned long) buffer, 0);
896 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
901 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
902 if (remain != NULL) {
903 printk(KERN_ERR "tap_setup_common - Extra garbage on "
904 "specification : '%s'\n", remain);
911 unsigned short eth_protocol(struct sk_buff *skb)
913 return eth_type_trans(skb, skb->dev);